So the old girl ('98 F150 4X4) is giving me issues. I have used this truck a bit for towing so now that the brakes are giving me trouble I figure that I may well need to give them super extra attention.
After the last tow I noticed that the brake pedal was surging like I had a warped rotor and it was moving a bit more than I liked. So, I started to look around. Front rotors looked ok but they will need replaced soon. Although I did find a few other issues.
Replaced or fixed
1) Rusty rear brake line, main master cylinder line to rear line and the two running to the wheel cylinders
2) Rusty line from master cylinder to the front brakes. Including across the front end to passenger side.
3) All rear hardware, shoes and drums.
Now, all was good till a while back and I found that I had a pulse in the brake pedal again. Now I took the drums off and checked them. They have 0.050" to 0.075" runout! What? Warped again? So I decided the the cheap drums burned me. Bought new drums and got the mid range drums.
After 200 miles, more pedal pulsing and drums are warped about as bad as last time. I rechecked all the rear hardware, primary shoe vs secondary shoe, air in the front lines etc.
The brake pedal moves a bit better than half way to get good braking and then it seems that the rear end twists and makes noise similar to a proportional valve problem.
All I can imagine is either a bad master cylinder that is not proportioning the front/rear brakes correctly, along with a booster that is going bad (it does swish at times) or ?????
I don't mind putting a bit of money in this truck cause it has served me well but am I missing something more simple?